Signal transmitting method and base station device

ABSTRACT

The present invention provides a signal transmitting method and a base station device. The signal transmitting method is applied to a base station device including a time domain exchanging module and a baseband processing unit, where the time domain exchanging module is connected to the baseband processing unit. The method includes: receiving, by the time domain exchanging module, a first time domain signal transmitted by a user equipment through a radio frequency channel of a serving cell of the user equipment, and receiving a second time domain signal transmitted by the user equipment through a radio frequency channel of a coordinating cell of the user equipment; and transmitting the first time domain signal and the second time domain signal to the baseband processing unit, which is corresponding to the serving cell of the user equipment. Through the present invention, CoMP data exchange can be implemented in an LTE-A system.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.13/774,589, filed on Feb. 22, 2013, which is a continuation ofInternational Application No. PCT/CN2011/082863, filed on Nov. 24, 2011.The afore-mentioned patent applications are hereby incorporated byreference in their entireties.

TECHNICAL FIELD

The present invention relates to communications technologies, and inparticular, to a signal transmitting method and a base station device.

BACKGROUND

In a long term evolution-advanced (Long Term Evolution-Advanced,hereinafter briefly referred to as LTE-A) system, high data ratecoverage may be increased by using a coordinated multi-pointtransmission/reception (Coordinated Multi-point Transmission/Reception,hereinafter briefly referred to as CoMP) technology, so as to improvecell edge throughput and/or increase system throughput. The so-calledCoMP refers to that multiple geographically separated transmissionpoints (which may be understood as different cells) cooperativelyparticipate in data transmission or reception of a user equipment (UserEquipment, hereinafter briefly referred to as UE).

The CoMP may be classified into downlink CoMP and uplink CoMP. Thedownlink CoMP refers to that multiple cells directly or indirectlyparticipate in transmission of downlink data of the same UE. The uplinkCoMP refers to that multiple cells simultaneously receive uplink data ofthe same UE and combine and process the uplink data by using a certaintechnology. The downlink CoMP is classified into joint processing andcoordinated scheduling. The joint processing mode may further beclassified into: joint transmission and dynamic cell selection. Thejoint transmission refers to that multiple cells simultaneously transmitdata for a UE through a physical downlink shared channel (PhysicalDownlink Shared Channel, hereinafter briefly referred to as PDSCH), soas to improve the quality of signals received by the UE and/or eliminateinterference from other UEs. The dynamic cell selection refers to thatonly one cell transmits data for the UE at any time and the cell may bedynamically selected from a CoMP coordination set. In the coordinatedscheduling mode, only a serving cell performs scheduling andtransmission for the UE, and mutual interference among different UEs maybe avoided by coordinating resources among the cells, such as time,frequency, power, space, etc.

During the process of implementing the present invention, the inventorfinds that although the LTE-A system supports the CoMP, data exchangebetween a serving cell and a coordinating cell in the LTE-A systemcannot be implemented in the prior art.

SUMMARY

The present invention provides a signal transmitting method and a basestation device, so as to implement CoMP data exchange in an LTE-Asystem.

In one aspect, the present invention provides a signal transmittingmethod, applied to a base station device including a time domainexchanging module and at least one baseband processing unit, where thetime domain exchanging module is separately connected to the at leastone baseband processing unit, the method including:

receiving, by the time domain exchanging module, a first time domainsignal transmitted by a first user equipment through a radio frequencychannel of a serving cell of the first user equipment, and receiving asecond time domain signal transmitted by the first user equipmentthrough a radio frequency channel of at least one coordinating cell ofthe first user equipment; and

transmitting, by the time domain exchanging module, the first timedomain signal and the second time domain signal to a baseband processingunit corresponding to the serving cell of the first user equipment inthe at least one baseband processing unit, so that the basebandprocessing unit corresponding to the serving cell of the first userequipment in the at least one baseband processing unit obtains frequencydomain signals of the first user equipment in the serving cell and theat least one coordinating cell of the first user equipment afterperforming time-frequency transformation and demapping on the first timedomain signal and the second time domain signal.

In another aspect, the present invention provides a base station device,including: a time domain exchanging module and at least one basebandprocessing unit, the time domain exchanging module being separatelyconnected to the at least one baseband processing unit, where

the time domain exchanging module is configured to receive a first timedomain signal transmitted by a first user equipment through a radiofrequency channel of a serving cell of the first user equipment, andreceive a second time domain signal transmitted by the first userequipment through a radio frequency channel of at least one coordinatingcell of the first user equipment; and transmit the first time domainsignal and the second time domain signal to a baseband processing unitcorresponding to the serving cell of the first user equipment in the atleast one baseband processing unit; and

the baseband processing unit corresponding to the serving cell of thefirst user equipment in the at least one baseband processing unit isconfigured to receive the first time domain signal and the second timedomain signal that are transmitted by the time domain exchanging module,and obtain frequency domain signals of the first user equipment in theserving cell and the at least one coordinating cell of the first userequipment after performing time-frequency transformation and demappingon the first time domain signal and the second time domain signal.

In the embodiments of the present invention, after receiving the firsttime domain signal transmitted by the first user equipment through theradio frequency channel of the serving cell of the first user equipmentand the second time domain signal transmitted by the first userequipment through the radio frequency channel of the at least onecoordinating cell of the first user equipment, the time domainexchanging module transmits the first time domain signal and the secondtime domain signal to the baseband processing unit corresponding to theserving cell of the first user equipment in the at least one basebandprocessing unit connected to the time domain exchanging module, so thatthe baseband processing unit corresponding to the serving cell of thefirst user equipment in the at least one baseband processing unitobtains the frequency domain signals of the first user equipment in theserving cell and the at least one coordinating cell of the first userequipment after performing time-frequency transformation and demappingon the first time domain signal and the second time domain signal. Inthis way, data exchange between the serving cell and the coordinatingcell may be implemented in the LTE-A system, thereby effectivelyreducing the influence of interference and improving the quality ofradio signals.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate the technical solutions according to the embodiments ofthe present invention or in the prior art more clearly, accompanyingdrawings required for describing the embodiments or the prior art areintroduced briefly below. Apparently, the accompanying drawings in thefollowing description are merely some embodiments of the presentinvention, and persons of ordinary skill in the art may further obtainother drawings according to the accompanying drawings without creativeefforts.

FIG. 1 is a flow chart of an embodiment of a signal transmitting methodof the present invention;

FIG. 2 is a schematic diagram of an embodiment of an applicationscenario of the present invention;

FIG. 3 is a flow chart of another embodiment of a signal transmittingmethod of the present invention;

FIG. 4 is a schematic diagram of another embodiment of an applicationscenario of the present invention;

FIG. 5 is a schematic diagram of still another embodiment of anapplication scenario of the present invention;

FIG. 6 is a flow chart of still another embodiment of a signaltransmitting method of the present invention;

FIG. 7 is a schematic diagram of yet another embodiment of anapplication scenario of the present invention;

FIG. 8 is a schematic structural diagram of an embodiment of a basestation device of the present invention;

FIG. 9 is a schematic structural diagram of another embodiment of a basestation device of the present invention;

FIG. 10 is a schematic structural diagram of still another embodiment ofa base station device of the present invention; and

FIG. 11 is a schematic structural diagram of yet another embodiment of abase station device of the present invention.

DESCRIPTION OF EMBODIMENTS

In order to make the objectives, technical solutions, and advantages ofthe present invention more comprehensible, the following describes thetechnical solutions according to the embodiments of the presentinvention with reference to the accompanying drawings. Apparently, theembodiments in the following description are merely a part rather thanall of the embodiments of the present invention. All other embodimentsobtained by persons of ordinary skill in the art based on theembodiments of the present invention without creative efforts shall fallwithin the protection scope of the present invention.

FIG. 1 is a flow chart of an embodiment of a signal transmitting methodof the present invention. The signal transmitting method provided bythis embodiment may be applied to a base station device including a timedomain exchanging module and at least one baseband processing unit,where the time domain exchanging module is separately connected to theat least one baseband processing unit.

As shown in FIG. 1, the signal transmitting method may include:

Step 101: The time domain exchanging module receives a first time domainsignal transmitted by a first user equipment through a radio frequencychannel of a serving cell of the first user equipment, and receives asecond time domain signal transmitted by the first user equipmentthrough a radio frequency channel of at least one coordinating cell ofthe first user equipment.

In this embodiment, when CoMP is performed, at least two cellscooperatively participate in data transmission or reception of a userequipment. The at least two cells are cells coordinating with eachother. For the first user equipment, in the at least two cells, at leastone cell other than the serving cell of the first user equipment is theat least one coordinating cell of the first user equipment, which is notdescribed again in other embodiments.

Step 102: The time domain exchanging module transmits the first timedomain signal and the second time domain signal to a baseband processingunit corresponding to the serving cell of the first user equipment inthe at least one baseband processing unit, so that the basebandprocessing unit corresponding to the serving cell of the first userequipment in the at least one baseband processing unit obtains frequencydomain signals of the first user equipment in the serving cell and theat least one coordinating cell of the first user equipment afterperforming time-frequency transformation and demapping on the first timedomain signal and the second time domain signal.

Specifically, the time domain exchanging module may transmit the firsttime domain signal and the second time domain signal to the basebandprocessing unit corresponding to the serving cell of the first userequipment according to a preconfigured coordination relationship. Inthis embodiment, the preconfigured coordination relationship may beconfigured, by an upper layer (for example, a base station controller),for the time domain exchanging module in the base station device, andthe preconfigured coordination relationship may be a signal transmittingrelationship in which the first time domain signal transmitted by thefirst user equipment through the radio frequency channel of the servingcell of the first user equipment and the second time domain signaltransmitted by the first user equipment through the radio frequencychannel of the at least one coordinating cell of the first userequipment are transmitted to the baseband processing unit correspondingto the serving cell of the first user equipment.

In the above embodiment, after receiving the first time domain signaltransmitted by the first user equipment through the radio frequencychannel of the serving cell of the first user equipment and the secondtime domain signal transmitted by the first user equipment through theradio frequency channel of the at least one coordinating cell of thefirst user equipment, the time domain exchanging module transmits thefirst time domain signal and the second time domain signal to thebaseband processing unit corresponding to the serving cell of the firstuser equipment in the at least one baseband processing unit connected tothe time domain exchanging module, so that the baseband processing unitcorresponding to the serving cell of the first user equipment in the atleast one baseband processing unit obtains the frequency domain signalsof the first user equipment in the serving cell and the at least onecoordinating cell of the first user equipment after performingtime-frequency transformation and demapping on the first time domainsignal and the second time domain signal. In this way, data exchangebetween the serving cell and the coordinating cell may be implemented inan LTE-A system, thereby effectively reducing the influence ofinterference and improving the quality of radio signals.

The method provided by the embodiment shown in FIG. 1 of the presentinvention may be applied to a scenario shown in FIG. 2. FIG. 2 is aschematic diagram of an embodiment of an application scenario of thepresent invention.

In FIG. 2, a cell 1 (Cell1) and a cell 2 (Cell2) are cells coordinatingwith each other. A serving cell of a UE1 is the cell 1, and acoordinating cell is the cell 2. In FIG. 2, a base station deviceincludes a time domain exchanging module and a baseband processing unitcorresponding to the cell 1, where the time domain exchanging module isconnected to the baseband processing unit corresponding to the cell 1.

FIG. 3 is a flow chart of another embodiment of a signal transmittingmethod of the present invention. In this embodiment, a CoMP process ofthe UE1 in FIG. 2 is taken as an example for illustration.

As shown in FIG. 3, the signal transmitting method may include:

Step 301: The time domain exchanging module receives a first time domainsignal transmitted by the UE1 through a radio frequency channel of thecell 1 and a second time domain signal transmitted by the UE1 through aradio frequency channel of the cell 2.

Step 302: The time domain exchanging module transmits the first timedomain signal and the second time domain signal to the basebandprocessing unit corresponding to the cell 1.

Specifically, the time domain exchanging module may transmit the firsttime domain signal and the second time domain signal to the basebandprocessing unit corresponding to the cell 1 according to a preconfiguredcoordination relationship.

In this embodiment, the preconfigured coordination relationship may beconfigured, by an upper layer (for example, a base station controller),for the time domain exchanging module in the base station device, andthe preconfigured coordination relationship may be a signal transmittingrelationship in which the first time domain signal transmitted by theUE1 through the radio frequency channel of the serving cell of the UE1and the second time domain signal transmitted by the UE1 through theradio frequency channel of the at least one coordinating cell of the UE1are transmitted to the baseband processing unit corresponding to thecell 1.

Step 303: The baseband processing unit corresponding to the cell 1obtains frequency domain signals of the UE1 in the cell 1 and the cell 2after performing time-frequency transformation and demapping on thefirst time domain signal and the second time domain signal.

Step 304: The baseband processing unit corresponding to the cell 1performs joint processing on the frequency domain signals of the UE1 inthe cell 1 and the cell 2.

For example, the baseband processing unit corresponding to the cell 1may first perform multiple input multiple output (Multiple InputMultiple Output, hereinafter briefly referred to as MIMO) decoding andequalization processing on the frequency domain signals of the UE1 inthe cell 1 and the cell 2, and then perform processing such as inversediscrete Fourier transform

(Inverse Discrete Fourier Transform, hereinafter briefly referred to asIDFT)/demodulation/de-interleaving/hybrid automatic repeat request(Hybrid Automatic Repeat Request, hereinafter briefly referred to asHARQ) combination/decoding/cyclic redundancy check (Cyclic RedundancyCheck, hereinafter briefly referred to as CRC).

In specific implementations, in the embodiments shown in FIG. 1 to FIG.3 of the present invention, the structure of the time domain exchangingmodule and the physical position of the at least one baseband processingunit may be implemented in different manners.

In an implementation manner of the present invention, the time domainexchanging module and the at least one baseband processing unit may belocated on a same baseband board of the base station device. As shown inFIG. 4, FIG. 4 is a schematic diagram of another embodiment of anapplication scenario of the present invention.

In FIG. 4, a cell 1 and a cell 2 are cells coordinating with each other.A serving cell of a UE1 is the cell 1, and a coordinating cell is thecell 2. In FIG. 4, a base station device includes a time domainexchanging module and a baseband processing unit corresponding to thecell 1, where the time domain exchanging module is a time domainexchanging chip, and the time domain exchanging chip and the basebandprocessing unit corresponding to the cell 1 are connected to each other,and are located on a same baseband board.

In the scenario shown in FIG. 4, a CoMP process of the UE1 may beobtained with reference to the description of the embodiment shown inFIG. 3 of the present invention, which is not described herein again.

In another implementation manner of the present invention, the timedomain exchanging module includes at least two time domain exchangingchips connected to one another, where the at least two time domainexchanging chips are located on different baseband boards in the basestation device. In this way, the receiving, by the time domainexchanging module, the first time domain signal transmitted by the firstuser equipment through the radio frequency channel of the serving cellof the first user equipment, and receiving the second time domain signaltransmitted by the first user equipment through the radio frequencychannel of the at least one coordinating cell of the first userequipment may be: receiving, by at least one time domain exchanging chipother than a first time domain exchanging chip in the at least two timedomain exchanging chips, the second time domain signal transmitted bythe first user equipment through the radio frequency channel of the atleast one coordinating cell of the first user equipment, andtransmitting the second time domain signal to the first time domainexchanging chip, where the first time domain exchanging chip in the atleast two time domain exchanging chips and the baseband processing unitcorresponding to the serving cell of the first user equipment arelocated on a same baseband board; and receiving, by the first timedomain exchanging chip, the first time domain signal transmitted by thefirst user equipment through the radio frequency channel of the servingcell of the first user equipment, and receiving the second time domainsignal transmitted by the at least one time domain exchanging chip.

In this implementation manner, the transmitting, by the time domainexchanging module, the first time domain signal and the second timedomain signal to the baseband processing unit corresponding to theserving cell of the first user equipment in the at least one basebandprocessing unit may be: transmitting, by the first time domainexchanging chip, the first time domain signal and the second time domainsignal to the baseband processing unit corresponding to the serving cellof the first user equipment.

FIG. 5 is a schematic diagram of still another embodiment of anapplication scenario of the present invention. In FIG. 5, a cell 1 and acell 2 are cells coordinating with each other. A serving cell of a UE1is the cell 1, and a coordinating cell is the cell 2.

In FIG. 5, a base station device includes a time domain exchangingmodule and a baseband processing unit corresponding to the cell 1, wherethe time domain exchanging module is formed by two time domainexchanging chips connected to each other. A first time domain exchangingchip in the two time domain exchanging chips and the baseband processingunit corresponding to the cell 1 are located on a same baseband board(for example, a first baseband board in FIG. 5), and a second timedomain exchanging chip in the two time domain exchanging chips isconnected to the first time domain exchanging chip, and is located on abaseband board different from the baseband board on which the first timedomain exchanging chip is located. In FIG. 5, the second time domainexchanging chip is located on a second baseband board.

FIG. 6 is a flow chart of still another embodiment of a signaltransmitting method of the present invention. In this embodiment, a CoMPprocess of the UE1 in the scenario shown in FIG. 5 is illustrated.

As shown in FIG. 6, the signal transmitting method may include:

Step 601: The second time domain exchanging chip receives a second timedomain signal transmitted by the UE1 through a radio frequency channelof the cell 2.

Step 602: The second time domain exchanging chip transmits the secondtime domain signal to the first time domain exchanging chip.

Step 603: The first time domain exchanging chip receives a first timedomain signal transmitted by the UE1 through a radio frequency channelof the cell 1, and receives the second time domain signal transmitted bythe second time domain exchanging chip.

The step in which the first time domain exchanging chip receives thefirst time domain signal transmitted by the UE1 through the radiofrequency channel of the cell 1 and step 601 may be successivelyperformed, and may also be performed in parallel, which is not limitedin this embodiment.

Step 604: The first time domain exchanging chip transmits the first timedomain signal and the second time domain signal to the basebandprocessing unit corresponding to the cell 1.

Step 605: The baseband processing unit corresponding to the cell 1obtains frequency domain signals of the UE1 in the cell 1 and the cell 2after performing time-frequency transformation and demapping on thefirst time domain signal and the second time domain signal.

Step 606: The baseband processing unit corresponding to the cell 1performs joint processing on the frequency domain signals of the UE1 inthe cell 1 and the cell 2.

For example, the baseband processing unit corresponding to the cell 1may first perform MIMO decoding and equalization processing on thefrequency domain signals of the UE1 in the cell 1 and the cell 2, andthen perform processing such as IDFT/demodulation/de-interleaving/HARQcombination/decoding/CRC.

In still another implementation manner of the present invention, thebaseband processing unit corresponding to the serving cell of the firstuser equipment in the at least one baseband processing unit is locatedon the first baseband board in the base station device, and the timedomain exchanging module is independently set in the base stationdevice, where being independently set refers to that the time domainexchanging module is not set on any baseband board in the base stationdevice. In this implementation manner, the transmitting, by the timedomain exchanging module, the first time domain signal and the secondtime domain signal to the baseband processing unit corresponding to theserving cell of the first user equipment in the at least one basebandprocessing unit may be:

transmitting, by the time domain exchanging module, the first timedomain signal and the second time domain signal to the basebandprocessing unit that is corresponding to the serving cell of the firstuser equipment and is located on the first baseband board.

FIG. 7 is a schematic diagram of yet another embodiment of anapplication scenario of the present invention. In FIG. 7, a cell 1 and acell 2 are cells coordinating with each other. A serving cell of a UE1is the cell 1, and a coordinating cell is the cell 2.

In FIG. 7, a base station device includes a time domain exchangingmodule and a baseband processing unit corresponding to the cell 1, wherethe time domain exchanging module may be a time domain exchanging chip,and the time domain exchanging chip is independently set in the basestation device; and the baseband processing unit corresponding to thecell 1 is located on a first baseband board in the base station device.

In the scenario shown in FIG. 7, after the time domain exchanging chipreceives a first time domain signal transmitted by the UE1 through aradio frequency channel of the cell 1 and a second time domain signaltransmitted by the UE1 through a radio frequency channel of the cell 2,the time domain exchanging chip may determine, according to apreconfigured coordination relationship, that the first time domainsignal and the second time domain signal need to be transmitted to thebaseband processing unit corresponding to the cell 1. Then, the timedomain exchanging chip may determine, according to a positiondistribution relationship between baseband processing units and basebandboards that is saved by the time domain exchanging chip, that thebaseband processing unit corresponding to the cell 1 is located on thefirst baseband board. Finally, the time domain exchanging chip transmitsthe first time domain signal and the second time domain signal to thebaseband processing unit that is corresponding to the cell 1 and islocated on the first baseband board. The operations performed after thebaseband processing unit corresponding to the cell 1 receives the firsttime domain signal and the second time domain signal may be obtainedwith reference to the description of step 303 to step 304 of theembodiment shown in FIG. 3 of the present invention, which are notdescribed herein again.

The preconfigured coordination relationship may be configured, by anupper layer (for example, a base station controller), for the timedomain exchanging chip. The preconfigured coordination relationship maybe a signal transmitting relationship in which the first time domainsignal transmitted by the UE 1 through the radio frequency channel ofthe serving cell of the UE1 and the second time domain signaltransmitted by the UE1 through the radio frequency channel of the atleast one coordinating cell of the UE1 are transmitted to the basebandprocessing unit corresponding to the cell 1.

Persons of ordinary skill in the art should understand that all or partof the steps of the method specified in any embodiment of the presentinvention may be implemented by a program instructing relevant hardware.The program may be stored in a computer readable storage medium. Whenthe program runs, the program executes the steps of the method specifiedin any embodiment above. The storage medium may be any medium capable ofstoring program codes, such as a ROM, a RAM, a magnetic disk, or anoptical disk.

FIG. 8 is a schematic structural diagram of an embodiment of a basestation device of the present invention, where the base station devicein this embodiment may implement the process of the embodiment shown inFIG. 1 of the present invention.

As shown in FIG. 8, the base station device may include: a time domainexchanging module 81 and at least one baseband processing unit 82, thetime domain exchanging module 81 being separately connected to the atleast one baseband processing unit 82, where

the time domain exchanging module 81 is configured to receive a firsttime domain signal transmitted by a first user equipment through a radiofrequency channel of a serving cell of the first user equipment, andreceive a second time domain signal transmitted by the first userequipment through a radio frequency channel of at least one coordinatingcell of the first user equipment; and transmit the first time domainsignal and the second time domain signal to a baseband processing unitcorresponding to the serving cell of the first user equipment in the atleast one baseband processing unit 82; and

the baseband processing unit corresponding to the serving cell of thefirst user equipment in the at least one baseband processing unit 82 isconfigured to receive the first time domain signal and the second timedomain signal that are transmitted by the time domain exchanging module81, and obtain frequency domain signals of the first user equipment inthe serving cell and the at least one coordinating cell of the firstuser equipment after performing time-frequency transformation anddemapping on the first time domain signal and the second time domainsignal.

In this embodiment, the baseband processing unit may be a layer 1 (L1)processing chip.

FIG. 8 shows an example in which the base station device includes onetime domain exchanging module 81 and one baseband processing unit 82. Atthis time, the one baseband processing unit 82 is the basebandprocessing unit corresponding to the serving cell of the first userequipment.

In the above embodiment, after receiving the first time domain signaltransmitted by the first user equipment through the radio frequencychannel of the serving cell of the first user equipment, and the secondtime domain signal transmitted by the first user equipment through theradio frequency channel of the at least one coordinating cell of thefirst user equipment, the time domain exchanging module 81 transmits thefirst time domain signal and the second time domain signal to thebaseband processing unit corresponding to the serving cell of the firstuser equipment in the at least one baseband processing unit 82 connectedto the time domain exchanging module 81, so that the baseband processingunit corresponding to the serving cell of the first user equipment inthe at least one baseband processing unit 82 obtains the frequencydomain signals of the first user equipment in the serving cell and theat least one coordinating cell of the first user equipment afterperforming time-frequency transformation and demapping on the first timedomain signal and the second time domain signal. In this way, dataexchange between the serving cell and the coordinating cell may beimplemented in an LTE-A system, thereby effectively reducing theinfluence of interference and improving the quality of radio signals.

FIG. 9 is a schematic structural diagram of another embodiment of a basestation device of the present invention. Different from the base stationdevice shown in FIG. 8, in this embodiment, the time domain exchangingmodule 81 and the at least one baseband processing unit 82 are locatedon a same baseband board of the base station device. FIG. 9 shows anexample in which the base station device includes one time domainexchanging module 81 and one baseband processing unit 82. At this time,the one baseband processing unit 82 is the baseband processing unitcorresponding to the serving cell of the first user equipment. As shownin FIG. 9, the time domain exchanging module 81 and the one basebandprocessing unit 82 are located on a first baseband board 83 in the basestation device.

In this embodiment, the time domain exchanging module 81 may be a timedomain exchanging chip.

The base station device can implement data exchange between the servingcell and the coordinating cell in an LTE-A system, thereby effectivelyreducing the influence of interference and improving the quality ofradio signals.

FIG. 10 is a schematic structural diagram of still another embodiment ofa base station device of the present invention. Different from the basestation device shown in FIG. 8, in this embodiment, the time domainexchanging module may include at least two time domain exchanging chipsconnected to one another, where the at least two time domain exchangingchips are located on different baseband boards in the base stationdevice, and a first time domain exchanging chip in the at least two timedomain exchanging chips and the baseband processing unit correspondingto the serving cell of the first user equipment are located on a samebaseband board of the base station device;

at least one time domain exchanging chip other than the first timedomain exchanging chip in the at least two time domain exchanging chipsis configured to receive a second time domain signal transmitted by afirst user equipment through a radio frequency channel of at least onecoordinating cell of the first user equipment, and transmit the secondtime domain signal to the first time domain exchanging chip; and

the first time domain exchanging chip is configured to receive a firsttime domain signal transmitted by the first user equipment through aradio frequency channel of a serving cell of the first user equipment,receive the second time domain signal transmitted by the at least onetime domain exchanging chip, and transmit the first time domain signaland the second time domain signal to the baseband processing unitcorresponding to the serving cell of the first user equipment.

FIG. 10 shows an example in which the base station device includes onetime domain exchanging module 81 and one baseband processing unit 82. Atthis time, the one baseband processing unit 82 is the basebandprocessing unit corresponding to the serving cell of the first userequipment. Besides, FIG. 10 shows an example in which the time domainexchanging module 81 includes two time domain exchanging chips connectedto each other. In FIG. 10, the two time domain exchanging chips are afirst time domain exchanging chip 811 and a second time domainexchanging chip 812.

The first time domain exchanging chip 811 and the baseband processingunit 82 corresponding to the serving cell of the first user equipmentare located on a first baseband board 84 in the base station device, andthe second time domain exchanging chip 812 is located on a secondbaseband board 85 in the base station device.

The base station device can implement data exchange between the servingcell and the coordinating cell in an LTE-A system, thereby effectivelyreducing the influence of interference and improving the quality ofradio signals.

FIG. 11 is a schematic structural diagram of yet another embodiment of abase station device of the present invention. Different from the basestation device shown in FIG. 8, in this embodiment, the basebandprocessing unit corresponding to the serving cell of the first userequipment in the at least one baseband processing unit is located on afirst baseband board in the base station device, and the time domainexchanging module is independently set in the base station device, wherebeing independently set refers to that the time domain exchanging moduleis not set on any baseband board in the base station device.

In this embodiment, the time domain exchanging module is specificallyconfigured to transmit the first time domain signal and the second timedomain signal to the baseband processing unit that is corresponding tothe serving cell of the first user equipment and is located on the firstbaseband board.

FIG. 11 shows an example in which the base station device includes onetime domain exchanging module 81 and one baseband processing unit 82. Atthis time, the one baseband processing unit 82 is the basebandprocessing unit corresponding to the serving cell of the first userequipment, and the baseband processing unit 82 is located on a firstbaseband board 86 in the base station device.

In this embodiment, the time domain exchanging module 81 may be a timedomain exchanging chip.

The base station device can implement data exchange between the servingcell and the coordinating cell in an LTE-A system, thereby effectivelyreducing the influence of interference and improving the quality ofradio signals.

It should be understood by persons skilled in the art that theaccompanying drawings are merely schematic diagrams of an exemplaryembodiment, and modules or processes in the accompanying drawings may benot necessarily required in implementing the present invention.

In addition, function units in the embodiments of the present inventionmay be integrated into a processing unit, or each of the units may existalone physically, or two or more units are integrated into a unit.

When being implemented in the form of a software function unit and soldor used as a stand-alone product, the functions may be stored in acomputer-readable storage medium. Based on such understanding, theessence of the technical solutions of the present invention, or the partthat makes contributions to the prior art, or the part of the technicalsolution may be embodied in the form of a software product. The computersoftware product may be stored in a storage medium, and incorporatesseveral instructions for instructing a computer device (for example, apersonal computer, a server, or a network device) to execute all or partof the steps of the method in any embodiment of the present invention.The storage medium includes any medium that is capable of storingprogram codes, such as a USB flash drive, a removable hard disk, aread-only memory (Read-Only Memory, and ROM for short), a random accessmemory (Random Access Memory, and RAM for short), a magnetic disk or anoptical disk.

Finally, it should be noted that the embodiments are merely provided fordescribing the technical solutions of the present invention, but notintended to limit the present invention. It should be understood bypersons of ordinary skill in the art that although the present inventionhas been described in detail with reference to the embodiments,modifications can be made to the technical solutions described in theembodiments, or equivalent replacements can be made to some or all thetechnical features in the technical solutions, as long as suchmodifications or replacements do not depart from the scope of thetechnical solutions of the embodiments of the present invention.

What is claimed is:
 1. A base station device, applied to a communicationsystem, in which a serving cell and a coordinating cell cooperativelyparticipate in data transmission or reception of a user equipment (UE),wherein the base station device comprises a baseband processing unitcorresponding to the serving cell; and a first time domain exchangingchip connected with the baseband processing unit, configured to receivea first time domain signal transmitted by the UE through a radiofrequency channel of the serving cell; and a second time domainexchanging chip coupled to the first time domain exchanging chip,configured to receive a second time domain signal transmitted by the UEthrough a radio frequency channel of the coordinating cell and transmitthe second time domain signal to the first time domain exchanging chip,wherein, the first time domain exchanging chip is further configured toreceive the second time domain signal and transmit the first time domainsignal and the second time domain signal to the baseband processingunit; wherein the baseband processing unit is configured to receive thefirst time domain signal and the second time domain signal, performtime-frequency transformation and demapping on the first time domainsignal and the second time domain signal to obtain frequency domainsignals of the UE in the serving cell and the coordinating cell, andjointly process the frequency domain signals of the UE.
 2. The deviceaccording to claim 1, wherein the first time domain exchanging chip isconfigured to transmit the first time domain signal and the second timedomain signal to the baseband processing unit according to apreconfigured coordination relationship.
 3. The device according toclaim 2, wherein the preconfigured coordination relationship is a signaltransmitting relationship in which the first time domain signal and thesecond time domain signal are transmitted to the baseband processingunit.
 4. The device according to claim 1, wherein the first time domainexchanging chip and the baseband processing unit are located on a samebaseband board of the base station device.
 5. The device according toclaim 1, wherein the first time domain exchanging chip and the secondtime domain exchanging chip are located on different baseband boards inthe base station device.
 6. A signal transmitting method, applied to acommunication system, in which a serving cell and a coordinating cellcooperatively participate in data transmission or reception of a userequipment (UE), wherein the method is performed by a base stationdevice, and the base station device comprises a baseband processing unitcorresponding to the serving cell, a first time domain exchanging chipconnected with the baseband processing unit, and a second time domainexchanging chip connected with the first time domain exchanging chip,and the method comprises: receiving, by the first time domain exchangingchip, a first time domain signal transmitted by the UE through a radiofrequency channel of the serving cell; receiving, by the second timedomain exchanging chip, a second time domain signal transmitted by theUE through a radio frequency channel of the coordinating cell, andtransmitting the second time domain signal to the first time domainexchanging chip; transmitting, by the first time domain exchanging chip,the first time domain signal and the second time domain signal to thebaseband processing unit; receiving, by the baseband processing unit,the first time domain signal and the second time domain signal;performing time-frequency transformation and demapping on the first timedomain signal and the second time domain signal to obtain frequencydomain signals of the UE in the serving cell and the coordinating cell;and jointly processing the frequency domain signals of the UE.
 7. Themethod according to claim 6, wherein transmitting, by the first timedomain exchanging chip, the first time domain signal and the second timedomain signal to the baseband processing unit, comprises: transmitting,by the first time domain exchanging chip, the first time domain signaland the second time domain signal to the baseband processing unitaccording to a preconfigured coordination relationship.
 8. The methodaccording to claim 7, wherein the preconfigured coordinationrelationship is a signal transmitting relationship in which the firsttime domain signal and the second time domain signal are transmitted tothe baseband processing unit.
 9. The method according to claim 6,wherein the first time domain exchanging chip and the basebandprocessing unit are located on a same baseband board of the base stationdevice.
 10. The method according to claim 6, wherein the first timedomain exchanging chip and the second time domain exchanging chip arelocated on different baseband boards in the base station device.
 11. Acommunication system, comprising a base station device and a userequipment (UE), wherein a serving cell and a coordinating cellcooperatively participate in data transmission or reception of the UE,wherein the base station device comprises a baseband processing unitcorresponding to the serving cell, a first time domain exchanging chipconnected with the baseband processing unit, and a second time domainexchanging chip connected with the first time domain exchanging chip,wherein, the first time domain exchanging chip is configured to receivea first time domain signal transmitted by the UE through a radiofrequency channel of the serving cell; the second time domain exchangingchip is configured to receive a second time domain signal transmitted bythe UE through a radio frequency channel of the coordinating cell, andtransmit the second time domain signal to the first time domainexchanging chip; the first domain exchanging chip is further configuredto transmit the first time domain signal and the second time domainsignal to the baseband processing unit; and the baseband processing unitis configured to receive the first time domain signal and the secondtime domain signal, perform time-frequency transformation and demappingon the first time domain signal and the second time domain signal toobtain frequency domain signals of the UE in the serving cell and thecoordinating cell, and jointly process the frequency domain signals ofthe UE.